Paste #byuLHKjJjD9QNG8WqvZ9 at spacepaste

#include <avr/io.h>

#include <avr/delay.h>

#include "i2cmaster.h"

#include "myFont.h"

//#define DevSSD1306 0xA2 // device address of EEPROM 24C02, see datasheet

#define DevSSD1306 0x78 // device address of SSD1306 OLED, uses 8-bit address (0x3c)!!!

// the memory buffer for the LCD

static uint8_t buffer[(128 * 64) / 8] = { // 128 x 64

0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55,

0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55

};

int main(void)

{

unsigned char ret;

DDRB = 0xff; // use all pins on port B for output

PORTB = 0x00; // (LED's low & off)

i2c_init(); // init I2C interface

/* write 0x75 to eeprom address 0x05 (Byte Write) */

ret = i2c_start(DevSSD1306+I2C_WRITE); // set device address and write mode

if ( ret ) {

/* failed to issue start condition, possibly no device found */

i2c_stop();

PORTB=0xff; // activate all 8 LED to show error */

}

else {

/* issuing start condition ok, device accessible */

// Init sequence for 128x64 OLED module

i2c_write(0xAE); // Display Off

i2c_write(0x00 | 0x0); // low col = 0

i2c_write(0x10 | 0x0); // hi col = 0

i2c_write(0x40 | 0x0); // line #0

i2c_write(0x81); // Set Contrast 0x81

i2c_write(0xCF);

// flips display

i2c_write(0xA1); // Segremap - 0xA1

i2c_write(0xC8); // COMSCAN DEC 0xC8 C0

i2c_write(0xA6); // Normal Display 0xA6 (Invert A7)

i2c_write(0xA4); // DISPLAY ALL ON RESUME - 0xA4

i2c_write(0xA8); // Set Multiplex 0xA8

i2c_write(0x3F); // 1/64 Duty Cycle

i2c_write(0xD3); // Set Display Offset 0xD3

i2c_write(0x0); // no offset

i2c_write(0xD5); // Set Display Clk Div 0xD5

i2c_write(0x80); // Recommneded resistor ratio 0x80

i2c_write(0xD9); // Set Precharge 0xd9

i2c_write(0xF1);

i2c_write(0xDA); // Set COM Pins0xDA

i2c_write(0x12);

i2c_write(0xDB); // Set VCOM Detect - 0xDB

i2c_write(0x40);

i2c_write(0x20); // Set Memory Addressing Mode

i2c_write(0x00); // 0x00 - Horizontal

i2c_write(0x40 | 0x0); // Set start line at line 0 - 0x40

i2c_write(0x8D); // Charge Pump -0x8D

i2c_write(0x14);

i2c_write(0xA4); //--turn on all pixels - A5. Regular mode A4

i2c_write(0xAF); //--turn on oled panel - AF

//drawBuffer(0,0,buffer);

//_delay_ms(1000);

clearBuffer(buffer);

////lcd_draw_char(10, 2, 'B', buffer);

lcd_draw_string(10, 0, "Hello World!", buffer);

//lcd_draw_string(10, 7, "Elegant Circuits", buffer);

drawBuffer(0,0, buffer);

i2c_stop();

}

for(;;){

}

void drawPixel(int16_t x, int16_t y){//, int16_t color){

//void drawPixel(int16_t x, int16_t y, int16_t color){

buffer[x+(y/8)*128] |= (1 << (y & 7));

}

void clearBuffer(uint8_t *buff){

memset(buff, 0, ((128 * 64)/8));

}

void drawBuffer(uint8_t column_address, uint8_t page_address, uint8_t *buff){

i2c_write(0x21); // column address

i2c_write(0); // column start address (0 = reset)

i2c_write(127); // column end addres (127 = reset)

i2c_write(0x22); // page address

i2c_write(0); // page start address (0 = reset);

i2c_write(7); // page end address

uint8_t twbrbackup = TWBR;

TWBR = 12;

for (uint16_t i=0; i<((128*64)/8); i++){

unsigned char ret = i2c_start(DevSSD1306+I2C_WRITE); // set device address and write mode

if ( ret ) {

/* failed to issue start condition, possibly no device found */

i2c_stop();

PORTB=0xff; // activate all 8 LED to show error */

}

else {

i2c_write(0x40); // set display RAM display start line register

for (uint8_t x=0; x<16; x++){

i2c_write(buff[i]);

i++;

}

i--;

i2c_stop();

TWBR = twbrbackup;

}

void lcd_draw_char(unsigned char column, unsigned char page, unsigned char letter, uint8_t *buff){

uint8_t ascii_offset = 32;

for(uint8_t i=0; i<5; i++){

buff[i+((page*128)+column)] = Ascii_1[letter-ascii_offset][i];

}

void lcd_draw_string(uint8_t column, uint8_t page, char *string, uint8_t *buff){

uint8_t i = 0;

while(string[0] != 0){

lcd_draw_char(column+(5*i), page, (string[0]), buff);

string++;

i++;

}

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